3 commits

Author	SHA1	Message	Date
Mark Johnston	097991f8ff	linuxkpi: Mitigate a seqlock livelock ... Disable preemption in seqlock write sections when using the _irqsave variant. This ensures that a writer can't be preempted and subsequently starved by a reader running in a callout handler on the same CPU. This fixes occasional display hangs seen when using the i915 driver. Tested by: emaste, wulf Reviewed by: wulf, hselasky Sponsored by: The FreeBSD Foundation (cherry picked from commit efb8f0b8db)	2022-05-09 08:32:09 -04:00
Vladimir Kondratyev	2d0694b953	LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards ... MFC after: 1 week Reviewed by: bz, emaste, hselasky, manu Differential Revision: https://reviews.freebsd.org/D33562 (cherry picked from commit 307f78f3ed)	2022-01-22 22:34:38 +03:00
Vladimir Kondratyev	801a4bcab6	LinuxKPI: Implement sequence counters and sequential locks ... as a thin wrapper around native version found in sys/seqc.h. This replaces out-of-base GPLv2-licensed code used by drm-kmod. Reviewed by: hselasky Differential revision: https://reviews.freebsd.org/D31006 (cherry picked from commit 8b33cb8303)	2021-07-21 01:43:52 +03:00